WO2006013663A1 - Bearing for locker arm - Google Patents
Bearing for locker arm Download PDFInfo
- Publication number
- WO2006013663A1 WO2006013663A1 PCT/JP2005/008671 JP2005008671W WO2006013663A1 WO 2006013663 A1 WO2006013663 A1 WO 2006013663A1 JP 2005008671 W JP2005008671 W JP 2005008671W WO 2006013663 A1 WO2006013663 A1 WO 2006013663A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rocker arm
- bearing
- inner ring
- outer ring
- qni
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/146—Push-rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
- F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
- F01L2305/02—Mounting of rollers
Definitions
- the present invention relates to a rocker arm bearing used for a rocker arm used for opening and closing an intake valve and an exhaust valve of an automobile engine, and more specifically to a rocker arm bearing having a long peeling life. is there.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2-180222
- the cam portion has a change in rotational speed of the bearing outer ring and a sudden change in applied load due to the cam shape where the lubrication conditions are strict. do.
- the demand for higher speed, smaller size, and higher stress has been issued, and the use environment is becoming more severe. For this reason, even after taking the above measures, there is a problem that peeling damage occurs in the outer ring outer diameter of the bearing for the rocker arm.
- An object of the present invention is to provide a bearing for a rocker arm including an outer ring which can more reliably suppress peeling damage while severe conditions of use progress.
- the rocker arm bearing according to the present invention has a shaft corresponding to an inner ring fixed to a rocker arm that is interposed between a valve and a cam of an engine to adjust intake and exhaust air, and is positioned outward of the inner ring. And an outer ring in contact with the cam, and a plurality of rolling elements positioned between the outer ring and the inner ring. Then, the outer ring has a nitrogen-rich layer, the grain size number of austenite crystal grains in the nitrogen-rich layer is in the range exceeding No. 10, and the surface of the outer diameter of the outer ring has a concave with a micro concave shape random. Have.
- a bearing for a rocker arm according to the present invention which is different from the above, has a shaft corresponding to an inner ring fixed to a rocker arm which is interposed between an engine valve and a cam to adjust intake and exhaust, and an outer ring of the inner ring. It is a bearing for a rocker arm provided with an outer ring which is located on the side and in contact with a cam.
- the outer ring has a nitrogen-rich layer, the grain size number of austenite crystal grains in the nitrogen-rich layer is in a range exceeding 10, and random micro-concave portions on the surface of the outer ring outer diameter. It has a hollow of shape.
- This rocker arm bearing is a type of bearing in which the inner ring and the outer ring directly contact each other without rolling elements.
- the above-mentioned random micro-concave depressions of the outer ring outer diameter surface have an axial surface roughness R (L) when the surface roughness is indicated by a parameter R value (ISO international standard).
- R (L) when the surface roughness is indicated by a parameter R value (ISO international standard).
- the ratio R (L) / R (C) to (C) is 1.0 or less, and the surface roughness parameter Sk value is
- R represents the roughness corresponding to the root mean square roughness R (old RMS) of the JIS standard.
- R (C) takes a reference length in the circumferential direction, that is, in the circumferential direction of the outer ring outer diameter surface.
- the groove is formed along the axial direction.
- the small grooves along the axial direction act as oil dams and facilitate the formation of an oil film on the outer diameter surface of the outer ring.
- the parameter Sk value of the surface roughness indicates the skewness of the distribution curve of the surface asperities, and the Sk value of a symmetrical distribution such as a Gaussian distribution is zero.
- the above Sk value corresponds to the skewness Rsk (distortion Sk) of the roughness curve of the JIS standard, and is defined by the following equation.
- the integration ⁇ is also performed up to the reference zero position force.
- the uneven shape of the surface is, for example, a convex portion with a flat top and rounded corners, ie, a series of inverted U-shaped convex portions, and the convex portions between the convex portions This is the case when sharp valleys are located.
- the uneven shape of the surface is, for example, pointed convex portions spaced apart, and a U-shaped valley is positioned between the pointed convex portions.
- the parameter Sk value is an average of less than or equal to 1.6 in both the circumferential direction and the axial direction, the shape and distribution of the surface recesses become advantageous for oil film formation depending on the processing conditions. Effect of the invention
- rocker arm bearing of the present invention it is an object of the present invention to provide a rocker arm bearing including an outer ring capable of suppressing peeling damage.
- FIG. 1 is a view showing a rocker arm including a rolling bearing according to an embodiment of the present invention.
- Fig. 2 is a cross-sectional view taken along the ⁇ - ⁇ line of Fig. 1.
- FIG. FIG. 4 is a view showing yet another type of rocker arm including the rolling bearing in the embodiment of the present invention.
- FIG. 5 is an enlarged view of a portion of the rolling bearing shown in FIG. 4;
- FIG. 6 is a view showing a heat treatment pattern applied to at least one of the inner ring, the outer ring and the rolling elements of the rolling bearing of the present invention.
- FIG. 7 is a view showing a heat treatment pattern of a modification of FIG. 6 applied to at least one of the inner ring, the outer ring and the rolling elements of the rolling bearing of the present invention.
- FIG. 8A is a view showing austenite grains (microstructure) of parts of the rolling bearing of the present invention.
- FIG. 8B is a view showing austenite grains (microstructure) of parts of a conventional rolling bearing.
- FIG. 9A is a view showing austenite grain boundaries illustrating FIG. 8A.
- FIG. 9B is a view showing austenite grain boundaries illustrating FIG. 8B.
- FIG. 10 A diagram showing distribution of Sk value and R of the outer ring surface of the bearing according to the present invention example and the prior art example
- FIG. 11 is an example of a concavo-convex pattern in the circumferential direction of the outer ring surface of the present invention example.
- FIG. 12 is a view showing an oil film formation rate of the outer ring of the example of the present invention.
- FIG. 13 is a view showing an oil film formation rate of the outer ring of the conventional example.
- rocker arm 1 rocker arm 2 inner ring (roller shaft) 3 needle roller (rolling element) 4 outer ring (roller) 4 a outer diameter surface of outer ring 5 rocker arm shaft (rotational shaft) 6 cam 7 Adjustment screw, 8 lock nut, 9 valve, 10 spring, 14 inner ring support, 19 bearing metal, 21 drive roll, 22 guide roll, 23 (3/4) "ball, 31 rolling fatigue life test
- the rocker arm 1 which is a rocking member is rotatably supported by a rocker arm shaft (rotational shaft) 5 via a bearing metal 19 or the like at a central portion.
- This rocker arm 1 Adjustment screw 7 is screwed on the other end lb of.
- the adjusting screw 7 is fixed by a lock nut 8 and abuts on the lower end thereof with the upper end of the valve 9 of the intake or exhaust valve of the internal combustion engine.
- the valve 9 is biased by the spring 10's force.
- the rocker arm 1 is provided with a rolling bearing 50 at one end la.
- the shaft 2 corresponding to the inner ring of the rolling bearing 50 is supported by a bifurcated inner ring support portion 14. Both ends of the shaft 2 corresponding to the inner ring are fixed to the bifurcated inner ring support 14 by press-fitting, both-sides caulking or a locking ring.
- a roller 4 constituting an outer ring is supported rotatably via a needle roller 3.
- the needle roller 3 constitutes a bearing interposed between the inner ring 2 and the outer ring 4. That is, the rolling element (needle roller) 3 intervenes between the inner ring 2 and the outer ring 4.
- the axial direction of needle roller 3 is disposed parallel to the axis of the inner ring.
- the outer peripheral surface of the outer ring 4 is in contact with the cam surface of the cam 6 provided on the cam shaft by the biasing force of the spring 10.
- a rolling bearing composed of a rolling element including the inner ring 2, needle rollers 3, and an outer ring 4 is used as a full-roller bearing for a forceker arm.
- a roller bearing for which a cage is not used is called a full roller bearing.
- the above-described full-roller bearing for a rocker arm rotates in contact with the cam 6, so the pressing force and the impact force of the cam 6 act on the outer ring 4.
- the rocker arm of the engine according to the embodiment of the present invention is a member provided with the full roller bearing for the rocker arm.
- the inner ring 2 adopts a hollow shaft but may be a solid shaft.
- the configuration may include rolling elements, that is, needle rollers, or a slide bearing that does not include needle rollers. That is, it may be of a type that does not include needle rollers, and the shaft corresponding to the inner ring and the outer ring are in direct contact and the inner ring and the outer ring are in sliding contact. In this case, because it is compact and has a small number of parts, it can be inexpensive and lightweight.
- Outer ring 4 has a nitrogen-rich layer, and the grain size number of austenite grains in the nitrogen-rich layer is so refined as to exceed ten. Furthermore, a random micro-concave recess is formed on the surface 4a of the outer diameter of the outer ring 4, and the surface roughness is indicated by the parameter R value (ISO international standard).
- the method of measuring the parameters Sk and R and the conditions can be illustrated as follows, for example.
- Measuring device surface roughness measuring instrument Surfcom 1400A (Tokyo Seimitsu Co., Ltd.)
- the rocker arm rolling bearing 50 is opened between one end lb of the rocker arm 1 and the other end la and has an axle 2 corresponding to the inner ring in an inner ring hole (not shown) extending between the two side walls. It is fixed, and one end lb abuts the end of the valve 9 of the engine, and the other end la is fitted with a pivot (not shown).
- the rocker arm 1 provided with the pivot hole 15 is biased by the spring 10 in a predetermined direction around the pivot and receives the driving force transmitted from the cam 6 by the roller 4 constituting the outer ring, Move valve 9 against the force.
- FIG. 4 A locker arm of an engine according to still another embodiment of the present invention will be described based on FIG. 4 and FIG.
- the rotation shaft 5 is disposed at the central portion of the rocker arm 1 and the rocker arm 1 is pivoted around it.
- One end lb of the rocker arm 1 abuts on the end of the valve 9 of the engine, and the other end la abuts on the end of the interlocking rod 16.
- the just screw 7 has a function of adjusting the contact position between the other end la of the rocker arm and the interlocking rod 16.
- a rolling shaft bearing for a rocker arm (full roller bearing for a rocker arm) 50 is attached by a mounting member 17 to a hollow bearing attaching portion 16 a located at the lower end of the interlocking rod 16.
- the cam 6 abuts on the outer ring 4 of the full roller bearing to transmit the driving force to the connecting rod.
- the nitrogen-rich layer, the austenite crystal grains, and the surface roughness are the same as in the embodiment of FIG. It is formed.
- heat treatment of the low temperature secondary hardening method described below is performed.
- random micro-concave depressions are formed on the surface 4a of the outer diameter of the outer ring 4 and the surface roughness is represented by the parameter R value (ISO international standard), the axial surface roughness R (L) and the circumference People
- the ratio R (L) / R (C) to the facing surface roughness R (C) is 1.0 or less, and the surface roughness
- Fig. 6 is a heat treatment pattern showing a method of performing primary hardening and secondary hardening
- Fig. 7 is a process of cooling the material to a temperature lower than the A1 transformation temperature during hardening, and then reheating and finally hardening
- It is a heat treatment pattern which shows a method.
- both are exemplary embodiments of the present invention.
- the treatment T1 carbon is diffused into the steel base and the carbon is sufficiently melted and then cooled to below the A1 transformation point.
- the temperature is reheated to a temperature lower than the treatment T1, and the force is also subjected to oil quenching.
- the crack strength is improved while carbonizing and nitriding the surface layer portion of the outer ring of the bearing for the rocker arm, rather than ordinary hardening, ie, once hardening once after carbonitriding treatment.
- the dimensional change rate over time can be reduced.
- the above heat treatment method it is possible to obtain a microstructure in which the grain size of austenite grains is less than or equal to a half of the conventional one.
- the outer ring subjected to the above heat treatment has a long rolling fatigue property, improves the cracking strength, and can reduce the dimensional change rate over time.
- FIGS. 8A, 8B, 9A and 9B the microstructure of the outer ring of the bearing, particularly austenite grains, will be described with reference to FIGS. 8A, 8B, 9A and 9B.
- conventional austenite grain sizes and grain sizes of IS standard are No. 10 or less, and the present invention According to the heat treatment method according to No. 12, fine grains of No. 12 can be obtained.
- the average particle size in FIG. 9A was 5.6 m as measured by the intercept method.
- micro concave-shaped depressions are formed by barrel polishing, and desired surface properties can be obtained by selecting the rotation speed of the polishing machine, the processing time, the work input amount, the type and size of the tip, and the like. Shot blasting etc. can also be used.
- FIG. 10 corresponding measurement data of the conventional example are shown together for comparison.
- One feature is that the absolute value power of the negative Sk value is greater than that of the conventional example.
- Another characteristic is that the distribution of R has a peak at a position considerably larger than zero.
- the oil film formation rate is improved by about 20% at the start of operation as compared with the conventional example so that the two components are compared.
- Peeling test pieces were manufactured using JIS standard SUJ2.
- the test piece has an outer diameter of ⁇ 40 ⁇ 40 ⁇ width L12.
- the manufacturing history of each test bearing is as follows.
- Test Sample No. l Carbonitriding temperature 850 ° C., holding time 150 minutes.
- the atmosphere was a mixed gas of RX gas and ammonia gas.
- the first quenching is performed from the carbonitriding temperature 850 ° C
- the second quenching is performed by heating the temperature at 800 ° C for 20 minutes lower than the carbonitriding temperature, and then performing the second quenching at 180 ° C for 90 minutes.
- Test Sample No. 3 (Comparative Example 2) Carburized and Carbonated (In a mixed gas atmosphere of RX gas and ammonia gas, after heating at a heating temperature of 850 ° C. for a holding time of 150 minutes, 850 ° C.) Quenched from 0 ° C, then tempered at 180 ° C for 90 minutes.) 0
- Table 1 and Table 2 show the results of the material examination and the peeling test of the test body manufactured by the above manufacturing method.
- the peeling test conditions are as shown in Table 3.
- the test sample No. 1 of the present invention example has a peeling strength 7 times or more that of the standard heat treated product No. 2, and the carbonitriding test product No. 3 and A peeling strength of 5 times or more could be obtained by comparison.
- Such a great improvement in the life is brought about by the improvement of the oil film forming ability by the fine austenite particle diameter as described above and the above-mentioned fine control of the surface asperity shape.
- the bearing for a rocker arm of the present invention By using the bearing for a rocker arm of the present invention, it is possible to greatly improve the peeling resistance performance of an outer ring that comes in contact with a cam under severe conditions. Since the outer ring of such bearing for rocker arm can be obtained by performing low temperature secondary hardening treatment and barrel polishing treatment, it will be widely used for the rocker arm of automobile engine whose use condition becomes severer in the future. It is expected to be done.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rolling Contact Bearings (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05738624A EP1801365A1 (en) | 2004-08-04 | 2005-05-12 | Bearing for locker arm |
JP2006531273A JPWO2006013663A1 (en) | 2004-08-04 | 2005-05-12 | Bearing for rocker arm |
US11/659,237 US20070289566A1 (en) | 2004-08-04 | 2005-05-12 | Bearing for Rocker Arm |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-228038 | 2004-08-04 | ||
JP2004228038 | 2004-08-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006013663A1 true WO2006013663A1 (en) | 2006-02-09 |
Family
ID=35786962
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/008671 WO2006013663A1 (en) | 2004-08-04 | 2005-05-12 | Bearing for locker arm |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070289566A1 (en) |
EP (1) | EP1801365A1 (en) |
JP (1) | JPWO2006013663A1 (en) |
CN (1) | CN101002005A (en) |
WO (1) | WO2006013663A1 (en) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02130205A (en) * | 1988-11-09 | 1990-05-18 | Ntn Corp | Engine rocker arm |
JPH04350310A (en) * | 1991-02-28 | 1992-12-04 | Ntn Corp | Cam follower with roller for engine |
JPH08233070A (en) * | 1995-03-02 | 1996-09-10 | Koyo Seiko Co Ltd | Roller for cam follower |
JP2548811B2 (en) * | 1989-11-30 | 1996-10-30 | エヌティエヌ株式会社 | Machine parts |
JP2001271910A (en) * | 2000-03-27 | 2001-10-05 | Koyo Seiko Co Ltd | Cam follower |
JP2003056315A (en) * | 2001-08-22 | 2003-02-26 | Ntn Corp | Roller-equipped cam follower |
JP2004115903A (en) * | 2002-09-30 | 2004-04-15 | Ntn Corp | Ball screw part and ball screw |
JP2004137605A (en) * | 2001-11-29 | 2004-05-13 | Ntn Corp | Heat treatment method of steel, and steel |
JP2004183589A (en) * | 2002-12-05 | 2004-07-02 | Nsk Ltd | Cam-follower device |
JP2004211686A (en) * | 2002-12-17 | 2004-07-29 | Mitsubishi Motors Corp | Valve system for internal combustion engine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4234868C2 (en) * | 1992-10-16 | 1999-10-28 | Schaeffler Waelzlager Ohg | Process for the production of a rocker arm or rocker arm |
US6224688B1 (en) * | 1997-08-18 | 2001-05-01 | Nsk Ltd. | Rolling bearing |
US6328009B1 (en) * | 1998-12-01 | 2001-12-11 | Competition Cams, Inc. | Valve lifter apparatus |
US7438477B2 (en) * | 2001-11-29 | 2008-10-21 | Ntn Corporation | Bearing part, heat treatment method thereof, and rolling bearing |
-
2005
- 2005-05-12 US US11/659,237 patent/US20070289566A1/en not_active Abandoned
- 2005-05-12 WO PCT/JP2005/008671 patent/WO2006013663A1/en not_active Application Discontinuation
- 2005-05-12 EP EP05738624A patent/EP1801365A1/en not_active Withdrawn
- 2005-05-12 JP JP2006531273A patent/JPWO2006013663A1/en active Pending
- 2005-05-12 CN CNA2005800264009A patent/CN101002005A/en active Pending
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02130205A (en) * | 1988-11-09 | 1990-05-18 | Ntn Corp | Engine rocker arm |
JP2548811B2 (en) * | 1989-11-30 | 1996-10-30 | エヌティエヌ株式会社 | Machine parts |
JPH04350310A (en) * | 1991-02-28 | 1992-12-04 | Ntn Corp | Cam follower with roller for engine |
JPH08233070A (en) * | 1995-03-02 | 1996-09-10 | Koyo Seiko Co Ltd | Roller for cam follower |
JP2001271910A (en) * | 2000-03-27 | 2001-10-05 | Koyo Seiko Co Ltd | Cam follower |
JP2003056315A (en) * | 2001-08-22 | 2003-02-26 | Ntn Corp | Roller-equipped cam follower |
JP2004137605A (en) * | 2001-11-29 | 2004-05-13 | Ntn Corp | Heat treatment method of steel, and steel |
JP2004115903A (en) * | 2002-09-30 | 2004-04-15 | Ntn Corp | Ball screw part and ball screw |
JP2004183589A (en) * | 2002-12-05 | 2004-07-02 | Nsk Ltd | Cam-follower device |
JP2004211686A (en) * | 2002-12-17 | 2004-07-29 | Mitsubishi Motors Corp | Valve system for internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
JPWO2006013663A1 (en) | 2008-07-31 |
US20070289566A1 (en) | 2007-12-20 |
EP1801365A1 (en) | 2007-06-27 |
CN101002005A (en) | 2007-07-18 |
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